gear ratio?
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gear ratio?
I just picked up an 86 f250 diesel out of CA and I was trying to figure out the axle ratio- jacked up the back, marked the driveshaft and tire, spun the driveshaft- 1 turn of the tire = approx 1.75 turn of the driveshaft. How can that be- is there a limited slip involved? Is the rear slipping? Did it with both tires up, 1 down, spun the tire and spun the driveshaft. Got the same results every time- I've never heard of an axle ratio under 2 something- am I being totally stupid? I have driven the truck but not over 35- the trans (C6) is slipping I think but the truck goes ok once it engages.
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Joined: Mar 2013
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From: Over There
If you are only turning one tire, you need to turn it twice to get the ring gear to turn once because of the differential. Look at it this way, 1 of 2 tires is turning, so it's turning 1/2 as much. When I do this I block one tire and turn the other 20 times, this turns the ring gear 10 times, so 35-1/2 turns of the driveline would be 3.55 gears, best most accurate way to do it.
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